| Fort Meade to Oerlinghausen | 3,983.30 mi (6,410.50 km) |
| Fort Meade to Oestrich-Winkel | 4,012.24 mi (6,457.08 km) |
| Fort Meade to Offenburg | 4,054.02 mi (6,524.31 km) |
| Fort Meade to Oftersheim | 4,054.20 mi (6,524.61 km) |
| Fort Meade to Ohrdruf | 4,097.07 mi (6,593.59 km) |
| Fort Meade to Ohringen | 4,096.52 mi (6,592.70 km) |
| Fort Meade to Olbernhau | 4,203.80 mi (6,765.37 km) |
| Fort Meade to Olching | 4,201.50 mi (6,761.66 km) |
| Fort Meade to Oldenburg | 3,933.75 mi (6,330.76 km) |
| Fort Meade to Oldenburg in Holstein | 4,002.47 mi (6,441.35 km) |
| Fort Meade to Olfen | 3,939.87 mi (6,340.60 km) |
| Fort Meade to Olpe | 3,976.89 mi (6,400.18 km) |
| Fort Meade to Olsberg | 3,993.32 mi (6,426.63 km) |
| Fort Meade to Oranienburg | 4,135.20 mi (6,654.96 km) |
| Fort Meade to Ortenberg | 4,044.43 mi (6,508.89 km) |
